The inside of the OmniSistem LED Derby effect light contains only 4 LEDs, yet it will easily give your lighting rig a huge boost of sparkling, colorful entertainment. This plug-and-play sound active light effect has a built-in microphone which initiates the LED lights to move around. This creates multicolored beams through the OmniSistem LED Derby's 20 panes which show up as fun patterns on the floor or wall you have it angled at.